Swimming Laps

I made the world's best eraser
It lets people you really really hate
Like I got rid of the dinosaurs and the ozone layer
And the taxes
(Well, two out of three ain't bad)

It takes care of names of faces of people of evil
Whom I just don't like because they interfere
So like them I intererase and change their story
To suit the one that sounds good in my head
The one I take with me to bed
That makes me feel good, and sugar-filled

And happy

My eraser is repetition